The Great Dividing Range is the longest mountain range in Australia, running roughly 3,500 km along the country's eastern edge from the tip of Cape York Peninsula in the tropical north, south through Queensland, New South Wales, the Australian Capital Territory, and Victoria, with extensions across Bass Strait into Tasmania. Although the range is generally low — its highest peak, Mount Kosciuszko in the Snowy Mountains, reaches only 2,228 m — it is the great water divide of the Australian continent: rivers rising on its eastern slopes drain to the Pacific and Tasman seas in short, fast courses, while rivers on the western slopes feed the Murray-Darling Basin, Australia's most important agricultural region. The range also includes the iconic Blue Mountains, the Atherton Tableland, the Snowy Mountains and ski country, the Australian Alps, and (across Bass Strait) the central highlands of Tasmania.
Introduction
The Great Dividing Range is not a single ridge but a wide, complex highland zone roughly 100 to 300 km wide that has been heavily eroded over hundreds of millions of years. Its name comes from its hydrological role — it divides the continent's eastern and inland drainage. Sydney sits east of it, the Murray-Darling Basin lies west of it, and the climate of every major eastern Australian city is influenced by it. Despite low elevations by world standards, the range supports the only ski resorts in Australia (in the Snowy Mountains and Victorian Alps), some of the most biodiverse rainforests in the country (Wet Tropics of Queensland, a UNESCO World Heritage Site), and the largest single area of temperate eucalypt forest on Earth.
Geography & Extent
The Great Dividing Range begins in the far north on Cape York Peninsula, where it forms the spine of tropical wet-season rainforest country. South of Cairns it includes the Atherton Tableland, then continues as a series of named ranges through Queensland — the McPherson Range on the Queensland-New South Wales border is the southern edge of subtropical rainforest. In New South Wales the range broadens into the New England Tablelands, the Blue Mountains west of Sydney, and the Snowy Mountains in the south. The Australian Alps span the Snowy Mountains and the Victorian Alps. South of the Australian mainland, the central highlands of Tasmania are usually treated as a southern continuation of the Great Dividing Range. Major rivers rising on the western slopes include the Murray, Murrumbidgee, Lachlan, Macquarie, Darling, and Condamine.
Geology & Formation
The Great Dividing Range is a very ancient highland system. Its bedrock includes Palaeozoic sedimentary, metamorphic, and granitic rocks dating back more than 300 million years, formed during a long succession of orogenic events along the eastern margin of Gondwana. The range was substantially uplifted during the Paleogene and Neogene, when the Tasman Sea opened and the eastern Australian margin warped upward. Some sections also include extensive Cenozoic volcanic provinces — the Atherton Tableland, the McBride and Sturgeon volcanic provinces, the Liverpool Range, and the Newer Volcanics in Victoria all reflect intraplate volcanism over the past few million years. Like the Western Ghats, the Great Dividing Range is a passive-margin highland rather than an active fold-and-thrust belt, which is why it is comparatively low.
Highest Peaks
- Mount Kosciuszko: 2,228 m (New South Wales, Snowy Mountains) — highest peak in Australia
- Mount Townsend: 2,209 m (New South Wales, Snowy Mountains)
- Mount Bogong: 1,986 m (Victoria) — highest peak in Victoria
- Mount Bartle Frere: 1,622 m (Queensland) — highest peak in Queensland
- Mount Ossa: 1,617 m (Tasmania) — highest peak in Tasmania
Climate & Weather
The range produces sharp climatic contrasts across its 3,500 km extent. The northern (Queensland) section is tropical, with very heavy summer monsoon rainfall on the windward eastern slopes (the Wet Tropics) and a sharp dry season inland. The central (New South Wales) section is temperate, with milder year-round conditions. The Snowy Mountains and Victorian Alps have a true alpine climate, with reliable winter snow and temperatures dropping below -20°C in the highest valleys; this supports Australia's ski industry (Thredbo, Perisher, Falls Creek, Mount Hotham). Tasmania's central highlands are cool and wet year-round, with substantial snow on the higher peaks. Bushfire is now the defining climatic risk along most of the range, with the catastrophic 2019-20 Black Summer fires burning massive areas of eucalypt forest.
Flora & Fauna
The Great Dividing Range hosts an extraordinary range of biomes. The Wet Tropics of Queensland contain the oldest continuously surviving rainforests on Earth — direct descendants of Gondwanan forests of more than 100 million years ago, with Eucalyptus marginalis, Cooper's Pine (Araucaria), and many endemic plants. The temperate eucalypt forests of New South Wales and Victoria are the largest in the world. Mountain ash (Eucalyptus regnans) in the Victorian Central Highlands is the tallest flowering plant species on Earth, with individual trees reaching over 100 m. Wildlife includes the platypus, echidna, koala, wombat, the recovering eastern quoll, the Tasmanian devil (Tasmania), lyrebirds, pademelons, and many endemic frogs.
Cultural & Historical Significance
The Great Dividing Range has been homeland to Aboriginal Australian peoples for at least 65,000 years — the oldest continuous human cultural presence anywhere on Earth. The range supported many distinct nations and language groups, with rock-art sites along the entire length (including the renowned Kakadu and Quinkan country in the north and the Carnarvon Gorge sites in central Queensland). The 19th-century European crossing of the Blue Mountains in 1813 by Blaxland, Wentworth, and Lawson opened the inland to colonial expansion and led to the rapid European settlement of the Bathurst Plains. The range remains central to modern Australian identity — Banjo Paterson's "The Man from Snowy River" is set in its high country, and the Snowy Mountains Hydroelectric Scheme of 1949-74 remains one of the largest infrastructure projects in Southern Hemisphere history.
Frequently Asked Questions
How long is the Great Dividing Range?
About 3,500 km, running from Cape York Peninsula in tropical north Queensland south through New South Wales and Victoria, with the central highlands of Tasmania often treated as its southern continuation. It is the third-longest land-based mountain range in the world after the Andes and Rockies.
What is the highest mountain in Australia?
Mount Kosciuszko in the Snowy Mountains of New South Wales, at 2,228 m. It is one of the easiest of the Seven Summits to climb, with a paved trail to the top.
Why is the Great Dividing Range called that?
Because it forms the great drainage divide of the Australian continent — rivers east of it flow to the Pacific and Tasman seas, while rivers west of it feed the Murray-Darling Basin, which drains the country's interior to the Southern Ocean via the Murray Mouth in South Australia.
Are there glaciers in the Great Dividing Range?
Not today. The Snowy Mountains and Tasmanian highlands carried small glaciers during the last Ice Age (the only mainland Australian glaciation), but no glaciers have survived into the Holocene. Permanent snow patches above 2,000 m are seasonal at best.
Final Thoughts
The Great Dividing Range is Australia's most important mountain system. It divides the country's drainage, structures its climate, hosts its only alpine ecosystems, and contains the oldest continuously surviving rainforests on Earth. Although low compared to the great fold mountain systems of Asia, Europe, and the Americas, the range is the defining geographical feature of the eastern third of the continent.
